diff --git a/src/map/script.c b/src/map/script.c
index 51c795a7c6..c829df26ee 100644
--- a/src/map/script.c
+++ b/src/map/script.c
@@ -13970,7 +13970,7 @@ BUILDIN_FUNC(replacestr)
 	}
 
 	if(script_hasdata(st, 5)) {
-		if(script_isint(st,5))
+		if( !script_isstring(st,5) )
 			usecase = script_getnum(st, 5) != 0;
 		else {
 			ShowError("script:replacestr: Invalid usecase value. Expected int got string\n");
@@ -14051,7 +14051,7 @@ BUILDIN_FUNC(countstr)
 	}
 
 	if(script_hasdata(st, 4)) {
-		if(script_isint(st,4))
+		if( !script_isstring(st,4) )
 			usecase = script_getnum(st, 4) != 0;
 		else {
 			ShowError("script:countstr: Invalid usecase value. Expected int got string\n");